Irish Cream Cheesecake

I received an Irish Pub Cookbook and am getting super stoked to cook through the entire thing!

Ingredients
 1 1/2 cups chocolate cookie crumbs
 1/3 cup confectioners' sugar
 1/3 cup unsweetened cocoa powder
 1/4 cup butter

 3 (8 ounce) packages cream cheese, softened
 1 1/4 cups white sugar
 1/4 cup unsweetened cocoa powder
 3 tablespoons all-purpose flour
 3 eggs
 1/2 cup sour cream
 1/4 cup Irish cream

Directions

Preheat oven to 350 degrees F . In a large bowl, mix together the cookie crumbs, confectioners' sugar and 1/3 cup cocoa. Add melted butter and stir until well mixed. Pat into the bottom of a 9 inch springform pan. Bake in preheated oven for 10 minutes; set aside. Increase oven temperature to 450 degrees F
In a large bowl, combine cream cheese, white sugar, 1/4 cup cocoa and flour. Beat at medium speed until well blended and smooth. Add eggs one at a time, mixing well after each addition. Blend in the sour cream and Irish cream liqueur; mixing on low speed. Pour filling over baked crust.
Bake at 450 degrees F  for 10 minutes. Reduce oven temperature to 250 degrees F, and continue baking for 60 minutes.
With a knife, loosen cake from rim of pan. Let cool, then remove the rim of pan. Chill before serving. If your cake cracks, a helpful tip is to dampen a spatula and smooth the top, then sprinkle with some chocolate wafer crumbs.